Inalienable rights: Rights for humankind that cannot be denied to anybody. They are life, liberty, and the pursuit of happiness.
Self-government: How the people of the USA can govern themselves, how they can play a part in the running of the government.
Separation of Powers: The separation of powers within the government, with the judicial, executive, and legislative branches.
The political and economic theories of Karl Marx and Friedrich Engels, later developed by their followers to form the basis for the theory and practice of communism.
The Iranian hostage crisis